Datasheet

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STARTUP WITH DEEPLY DEPLETED BATTERY CONNECTED
bq2406x
SLUS689A – JUNE 2006 – REVISED OCTOBER 2006
See the application section for additional details on start-up operation with V(BAT) < V
(SC)
.
The bq2406x charger furnishes the programmed charge current if a battery is detected. If no battery is
connected the bq2406x operates as follows:
• The output current is limited to 22 mA (typical), if the voltage at BAT pin is below the short circuit detection
threshold V
(SC)
, 1.8 V typical.
• The output current is regulated to the programmed pre-charge current if V
(SC)
< V(BAT) < V
(LOWV)
.
• The output current is regulated to the programmed fast charge current If V(BAT) > V
(LOWV)
AND voltage
regulation is not reached.
The output voltage collapses if no battery is present and the end equipment requires a bias current larger that
the available charge current.
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